<template>
  <div class="slide-show" @mouseover="clearInv" @mouseout="runInv">
    <div class="slide-img">
      <router-link :to="slides.list[nowIndex].toKey">
        <transition name="slide-trans">
          <img v-if="isShow" :src="slides.list[nowIndex].src">
        </transition>
        <transition name="slide-trans-old">
          <img v-if="!isShow" :src="slides.list[nowIndex].src">
        </transition>
      </router-link>
    </div>
    <h2 v-text="slides.list[nowIndex].title"></h2>
    <ul class="slide-pages">
      <li @click="goto(prevIndex)">&lt;</li>
      <li v-for="(item,index) in slides.list" @click="goto(index)">
        <a :class="{on:index === nowIndex}">{{index+1}}</a>
      </li>
      <li @click="goto(nextIndex)">&gt;</li>
    </ul>
  </div>
</template>

<script>
    export default {
      name: "slideShow",
      data(){
          return{
            nowIndex:0,
            isShow: true
          }
      },
      props:{
        slides:{
          type:Object,
          default:{
            invTimes:1000,
            list:[]
          }
        }
      },
      computed: {
        prevIndex () {
          if (this.nowIndex === 0) {
            return this.slides.list.length - 1
          }
          else {
            return this.nowIndex - 1
          }
        },
        nextIndex () {
          if (this.nowIndex === this.slides.list.length - 1) {
            return 0
          }
          else {
            return this.nowIndex + 1
          }
        }
      },
      methods:{
        goto(index){
          this.isShow = false
          setTimeout(() => {
            this.isShow = true
            this.nowIndex = index
            this.$emit('onchange',index)
          }, 10)
        },
        runInv () {
          this.invId = setInterval(() => {
            this.goto(this.nextIndex)
          }, this.slides.invTimes)
        },
        clearInv () {
          clearInterval(this.invId)
        }
      },
      mounted(){
        console.log(this.slides)
        this.runInv()
      }
    }
</script>

<style scoped>
  .slide-trans-enter-active {
    transition: all .5s;
  }
  .slide-trans-enter {
    transform: translateX(840px);
  }
  .slide-trans-old-leave-active {
    transition: all .5s;
    transform: translateX(-840px);
  }
  .slide-show {
    position: relative;
    margin: 15px 15px 15px 0;
    width: 840px;
    height: 500px;
    overflow: hidden;
  }
  .slide-show h2 {
    position: absolute;
    width: 100%;
    height: 100%;
    color: #fff;
    background: #000;
    opacity: .5;
    bottom: 0;
    height: 30px;
    text-align: left;
    padding-left: 15px;
  }
  .slide-img {
    width: 100%;
  }
  .slide-img img {
    width: 100%;
    position: absolute;
    top: 0;
  }
  .slide-pages {
    position: absolute;
    bottom: 10px;
    right: 15px;
  }
  .slide-pages li {
    display: inline-block;
    padding: 0 10px;
    cursor: pointer;
    color: #fff;
  }
  .slide-pages li .on {
    text-decoration: underline;
  }
</style>
